/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.mpp.plan.planner.plan.node.process;

import org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNode;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNodeId;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNodeType;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanVisitor;
import org.apache.iotdb.db.mpp.plan.planner.plan.parameter.OrderByParameter;
import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;

import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

public class MergeSortNode extends MultiChildProcessNode {

    private final OrderByParameter mergeOrderParameter;

    private final List<String> outputColumns;

    public MergeSortNode(
            PlanNodeId id, OrderByParameter mergeOrderParameter, List<String> outputColumns) {
        super(id);
        this.mergeOrderParameter = mergeOrderParameter;
        this.outputColumns = outputColumns;
    }

    public OrderByParameter getMergeOrderParameter() {
        return mergeOrderParameter;
    }

    @Override
    public PlanNode clone() {
        return new MergeSortNode(getPlanNodeId(), getMergeOrderParameter(), outputColumns);
    }

    @Override
    public List<String> getOutputColumnNames() {
        return outputColumns;
    }

    @Override
    public <R, C> R accept(PlanVisitor<R, C> visitor, C context) {
        return visitor.visitMergeSort(this, context);
    }

    @Override
    protected void serializeAttributes(ByteBuffer byteBuffer) {
        PlanNodeType.MERGE_SORT.serialize(byteBuffer);
        mergeOrderParameter.serializeAttributes(byteBuffer);
        ReadWriteIOUtils.write(outputColumns.size(), byteBuffer);
        for (String column : outputColumns) {
            ReadWriteIOUtils.write(column, byteBuffer);
        }
    }

    @Override
    protected void serializeAttributes(DataOutputStream stream) throws IOException {
        PlanNodeType.MERGE_SORT.serialize(stream);
        mergeOrderParameter.serializeAttributes(stream);
        ReadWriteIOUtils.write(outputColumns.size(), stream);
        for (String column : outputColumns) {
            ReadWriteIOUtils.write(column, stream);
        }
    }

    public static MergeSortNode deserialize(ByteBuffer byteBuffer) {
        OrderByParameter orderByParameter = OrderByParameter.deserialize(byteBuffer);
        int columnSize = ReadWriteIOUtils.readInt(byteBuffer);
        List<String> outputColumns = new ArrayList<>();
        while (columnSize > 0) {
            outputColumns.add(ReadWriteIOUtils.readString(byteBuffer));
            columnSize--;
        }
        PlanNodeId planNodeId = PlanNodeId.deserialize(byteBuffer);
        return new MergeSortNode(planNodeId, orderByParameter, outputColumns);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        if (!super.equals(o)) {
            return false;
        }
        MergeSortNode that = (MergeSortNode) o;
        return Objects.equals(mergeOrderParameter, that.getMergeOrderParameter());
    }

    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(), mergeOrderParameter);
    }

    @Override
    public String toString() {
        return "MergeSort-" + this.getPlanNodeId();
    }
}
